Remove Object::IsSpecObject, use Object::IsJSReceiver instead.

src/property-descriptor.cc

Index: src/property-descriptor.cc
diff --git a/src/property-descriptor.cc b/src/property-descriptor.cc
index ac35559981cbd1e1e6af51bdef1a751f0ebdcaee..243a9faac3a76cd33f1d5563cb065b5b5e34c772 100644
--- a/src/property-descriptor.cc
+++ b/src/property-descriptor.cc
@@ -148,7 +148,7 @@ bool PropertyDescriptor::ToPropertyDescriptor(Isolate* isolate,
                                               PropertyDescriptor* desc) {
   // 1. ReturnIfAbrupt(Obj).
   // 2. If Type(Obj) is not Object, throw a TypeError exception.
-  if (!obj->IsSpecObject()) {
+  if (!obj->IsJSReceiver()) {
     isolate->Throw(*isolate->factory()->NewTypeError(
         MessageTemplate::kPropertyDescObject, obj));
     return false;